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surface charge density of soap bubble of radius r and surface tension t is sigma . if p is excess pressure the value of sigma
surface charge tension = Tsurface charge density= the total pressure in the soap bubble=Pin -Pout = 4T/R-2/20 Excess pressure inside the charge soap bubblepin-pout = pexceesP = 4T/R-2/20 2=20 [4T/R- p] = {20 [4T/R- p]}1/2 2
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